Automatic Brake Controller will generate asymmetric DCC to activate the braking feature on suitably equipped DCC decoders.
ABC is incorporated in Zimo, Lenz ESU and many other decoders.
The DCC waveform is slightly modified by reducing the voltage on one side of the waveform by around 1.6 Volts. This activates the ABC feature on the DCC decoder (if present) and causes the locomotive to gently stop. When the circuit is deactivated the locomotive will gently accelerate.
The idea of Digitrains was conceived over the dinner table and grew very slowly as doubts calmed missionary zeal. We finally took the plunge in January 2005 and are fortunate to be dealers for some of the best and most user friendly DCC equipment available.